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(NoMdeL) 'T. A. EDISON.

v INGANDESGENT ELECTRIC. LAMP. No. 358,599. Patented Mar. 1, 1887 D fl11 W I Z) a WITNESSES? INVENTOR: ISJM++- ATTORNEYS.

UNIT D STATES PATENT OFFICE.

THOMAS A. EDISON, OF MENLO PARK, N EYV JERSEY, ASSIGNOR TO THE EDISONELECTRIC LIGHT COMPANY, OF NEYV YORK, N. Y.

INCANDESOENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 358,599, dated March 1,1887.

Application filed November 28, 1881. Serial No. 46,754.

To all whom it may concern:

Be it known that I, THOMAS A. EDIsoN, of Menlo Park, in the county ofMiddlesex and State of New Jersey, have invented a new and usefulImprovement in Incandescing Electric Lamps, (Case No. 363;) and I dohereby declare that the following is a full and exact description of thesame, reference being had to the accompanying drawing and to the lettersof reference marked thereon.

The object I have in view is to produce a simple and efficient meansforjoining the two glass parts of an incandesciug electric lamp, so thatwhen the carbon breaks said parts can be readily separated and usedagain.

In carrying outmy invention I support the bulb or globe and unite thesame with the tubular wire-support before the globe is exhausted, bymeans of a cement or other material or substance which is suflicientlyplastic to permit of its being molded or formed upon the partsatthejoint or is capable of being made plastic by heat or otherwise, andwhich her dens or can be hardened when in position, so as to hold theparts firmly together, and which, further, is ofsuch nature that it willadhere to the glass surfaces of the two parts of the lamp and 'will forman airtight joint. For this purpose I prefer to use celluloid or rubber,

either of which can be applied in a plastic condition and molded overthe joint, around the bottom of the globe and then hardened, thecelluloid being hardened by exposure and the rubber by vulcanization.

The drawing represents in vertical section a lamp constructed in thismanner.

A is the glass inclosing bulb or globe.

B is the tubular glass wire and carbon support.

(No model.)

only means for uniting the two parts and supporting the globe upon theglass wire-support.

As before stated, other suitable substances or materials could be usedinstead of celluloid or rubber, such as any resinous cement which willadhere to the surface of the glass parts. After this joint is formed,the globe is eX- hausted and sealed off at c.

\Vhat I claim is In an incandescent electric lamp, the 00111- bination,with the open-mouthed glass globe and the glass wire-support enteringcentrally the mouth of said globe, of a hardened plastic materialapplied to the outside both of the wire-support and of the globe,forming an airtight joint between them, substantially as set forth.

This specification signed and witnessed this 29th day of October, 1881.

THOS. A. EDISON.

\Vitnesses:

Biol-i1). N. DYER, H. W. SEELY.

